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Osteodensitometry: Bone Density Measurement

Osteodensitometry is a diagnostic imaging procedure used to measure bone mineral density. It is the primary method for early detection of osteoporosis and assessing fracture risk.

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Things worth knowing about "Osteodensitometry"

Osteodensitometry is a diagnostic imaging procedure used to measure bone mineral density. It is the primary method for early detection of osteoporosis and assessing fracture risk.

What is Osteodensitometry?

Osteodensitometry, also known as bone densitometry or bone mineral density (BMD) testing, is a medical examination used to measure the amount of minerals – primarily calcium – contained within the bones. Higher mineral content indicates stronger, more resilient bones. Osteodensitometry is the most important diagnostic tool for the early detection and monitoring of osteoporosis, a condition in which bones progressively lose density and structural strength, making them more susceptible to fractures.

Methods of Osteodensitometry

Several techniques are available for measuring bone density. The internationally recognized gold standard is the DXA scan (Dual-Energy X-ray Absorptiometry, also written as DEXA).

DXA Scan (Dual-Energy X-ray Absorptiometry)

During a DXA scan, two X-ray beams of different energy levels are passed through the body. By analyzing how much of each beam is absorbed by bone versus soft tissue, the bone mineral density can be calculated with high precision. Measurements are typically taken at the lumbar spine and hip, as these sites are most commonly affected by osteoporosis. The radiation exposure is very low – considerably less than a standard chest X-ray.

Other Methods

Quantitative Computed Tomography (QCT): A three-dimensional measurement of bone density using CT imaging; involves higher radiation exposure than DXA.
Quantitative Ultrasound (QUS): A radiation-free method, often applied at the heel bone; suitable as a screening tool but less precise than DXA.
Peripheral DXA (pDXA): Measurement at peripheral sites such as the forearm or heel, typically used as a supplementary examination.

When is Osteodensitometry Recommended?

A bone density scan is recommended in the following situations:

Women aged 70 and older and men aged 80 and older (screening)
Early menopause (before age 45)
Long-term use of corticosteroids
Previous low-trauma fractures (fragility fractures)
Medical conditions associated with increased osteoporosis risk (e.g., rheumatoid arthritis, celiac disease, thyroid disorders)
Significant underweight or eating disorders
Family history of osteoporosis or hip fracture

Interpreting Results: The T-Score

The result of a bone density measurement is expressed as a T-score. This value compares the measured bone density with the average peak bone density of a healthy young adult reference population:

T-score ≥ −1.0: Normal bone density
T-score between −1.0 and −2.5: Osteopenia (low bone density, a precursor to osteoporosis)
T-score ≤ −2.5: Osteoporosis
T-score ≤ −2.5 with fracture: Severe osteoporosis

In addition, a Z-score may be calculated, which compares bone density to an age-matched reference group. This is particularly useful when evaluating younger patients.

The Examination Procedure

Osteodensitometry is a painless and non-invasive procedure. The scan typically takes 10 to 20 minutes. The patient lies on a padded table while a scanning arm passes over the body. No special preparation is required, and no injections or contrast agents are needed. Metal implants or recent nuclear medicine scans (e.g., bone scintigraphy) may affect results and should be reported to the referring physician in advance.

Clinical Relevance for Osteoporosis Management

Osteodensitometry is indispensable for the diagnosis, treatment planning, and monitoring of osteoporosis. When combined with clinical risk factors – for example, using the FRAX tool developed by the WHO – it enables an individualized estimate of the 10-year fracture probability. Depending on the results, appropriate interventions may include dietary adjustments, targeted exercise therapy, calcium and vitamin D supplementation, or pharmacological treatment with agents such as bisphosphonates.

References

Kanis J.A. et al.: European guidance for the diagnosis and management of osteoporosis in postmenopausal women. Osteoporosis International, 2019;30(1):3–44.
World Health Organization (WHO): Assessment of fracture risk and its application to screening for postmenopausal osteoporosis. WHO Technical Report Series, No. 843, Geneva, 1994.
National Osteoporosis Foundation (NOF): Clinician's Guide to Prevention and Treatment of Osteoporosis. Washington, D.C., 2014.

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